BA crew are usually superb when it comes to things like this. Earlier this year, I had a trip with friends celebrating a birthday and we had the same crew on the outbound as on the return. On the return, they actually sang happy birthday to me in 1A and then as I got off the flight, had a signed card and a few mini bottles of champagne to take away. Lovely gesture and I’ll be keeping the card as a memento of a great experience.